Transportable core drilling machine for roadways



TRANSPORTABLE CORE DRILLING MACHINE FOR ROADW Filed Dec. 25, 1965 Fm. I

INVENTOR Emvsr- 0 TTO HEIJE BY MW a wuza,

ATIORNE'YS United States Patent 6 Claims. Cl. 173-23 The presentinvention relates to a transportable core drilling apparatusparticularly suited for taking core samples of concrete, masonry units,bituminous surfaces and the like.

The core samples obtained by the apparatus of the present invention aresubjected to testing to determine the composition thereof.

It is an object of the present invention to provide a core drillingapparatus for taking sample cores from roadways and pavements.

Another object of the invention is to provide a core drilling apparatushaving its own source of power and drill wash water.

A particular object of the invention is to provide a core drillingapparatus operable by one man.

Other objects of the invention are a core drilling apparatus providingfaster transportation to and erection of the apparatus at the place ofuse.

The present invention is an improvement over the prior art Sample TakingMachine of F. L. Howard, disclosed in Us. Patent No. 2,084,686, theapparatus of which is incorporated by reference into the presentapplication.

The prior art core drilling machines had many disadvantages includingthe necessity of a number of helpers for mounting them in position witha resulting increase in the cost of taking samples.

Accordingly to the present invention, the cost of taking samples isreduced by more than half as a result of the suitable construction andadaptation of the apparatus.

A particular embodiment suggested by the present invention provides asingle-axle trailer with a rotary pin spring axle and supporting wheelswhich is designed for a total permissible weight of 800 kg. and ahighway speed of 80 km./hour. This trailer is provided with stop andtaillights and means for illuminating the license plate.

The trailer carries a firmly mounted chassis plate, e.g., of mm. steel,which also serves as supporting means for a barrel of about 200 literscapacity carrying washing water. This carrier for the water barrel alsoserves as a tool box and as a pivotal mounting for a positioning lever.

For obtaining the core, a drilling mechanism such as disclosed in US.Patent No. 2,084,686 is used. The drilling mechanism may comprise astrong steel post with guide bars welded to it for guiding the drillingmechanism, all of these parts being mounted on a ground plate. Thedrilling mechanism is driven, for example, by a 4-cycle gasoline enginewith direct flanged drive. The speed of rotation is so chosen that adrill head of 200 mm. diameter will have a perpiheral velocity of about2 meters per second.

In the single-axle trailer of the present invention, the axle serves asa support to permit tilting of the entire apparatus.

For the boring operation, a tilting lever is manipulated in such amanner that the weight of the entire apparatus is thrown upon the groundplate and the transport wheels at the ends of the axle are lifted fromthe ground. The total weight of the attachment resting upon the loweredground plate ensures safe support of the machine on the pavement.

The ground plate which can also be formed of 15 mm. steel is providedwith two strong pivot bearings for the tilting lever which swingsthrough a large angle. The ground plate carries two strong snapconnections for connecting the ground plate with the supporting plate ofthe chassis.

Other objects and features of the invention may be perceived from thefollowing detailed description of a particular embodiment of theinvention, throughout which description reference is made to theaccompanying drawings, wherein:

FIGURE 1 is a perspective view of the single axle apparatus with thedrilling mechanism lowered from its transport position by a partialrotation of the handle-bar; and

FIGURE 2 is a perspective view of the apparatus in working position withits handle-bar lowered.

In FIGURE 1 the apparatus is shown with the drilling mechanism loweredfrom its transport position and comprises a chassis in the form of aplate-like supporting frame carried by a rotary pin spring axle 2 oneach end of which a truck wheel 3 is mounted. The front end of thesupporting frame is provided with a coupler 4 for connecting it to therear end of a motor vehicle for transportation.

The truck wheel 3 and ground plate 5 rest on the surface of the roadway.Ground plate 5 is held in place by two pivot bearings 7 and carries anupright post 5' for supporting a core drilling mechanism 6 which isdriven by a 4-cycle gasoline engine and has a direct flange connectionwith the drill head 15. A handle-bar 8 has its opposite ends pivotallyconnected at 9 to the supporting frame 1. A lever and link mechanismcomprising a triangular frame 10 is connected to the pivot bearing 7 ateach side of the ground plate 5, and these two triangular frames arepivotally connected at 11 to the bottom of the plate-like portion of thesupporting frame 1. The remaining corner 12 of each triangular frame 10is connected by links 13 with pivot bearings 14 on the parallel sidearms of handle-bar 8. By means of these triangular frames actuated byhandle-bar 8 through connecting links 13, the ground plate 5 can bepositioned on the surface of the pavement, as shown in FIGURE 2, and thetruck wheels 3 lifted from the pavement.

Suitable cutting heads and water connections such as those disclosed inUS. Patent No. 2,084,686 are also provided.

For centering the drill head 15, adjustable roller guides 16 areprovided.

When the drilling machine is in its working position, the operator, whois also the driver of the motor vehicle, seats himself on one of thefenders 17 and while in that position readily controls the operation ofthe drilling machine.

In contrast to the core drilling machines of previous constructions, thepresent machine is capable of quick installation and can be mounted andoperated by one person.

The core which is taken from the pavement is used to ascertain thethickness and condition of the pavement.

The front portion of the attachment with its water barrel and tool box,the rear portion of it with its core drilling mechanism are balancedwith each other in the most advantageous manner.

From the foregoing description, one skilled in the art can easilyascertain the essential characteristics of this invention, and withoutdeparting from the spirit and scope thereof, can make various changesand modifications of the invention to adapt it to various usages andconditions. Consequently, such changes and modifications are properly,equitably, and intended to be, within the full range of equivalence ofthe following claims.

What is claimed is:

1. A transportable core drilling apparatus having core drilling meansfor taking pavement samples, the improvement comprising a single axletrailer chassis, said core drilling means mounted on a rigid groundplate, lever means pivotally connecting said chassis and said groundplate and a counter-balance mounted on the front of said chassis wherebysaid core drilling means is shifted from a transport position to thesurface of the pavement by means of said lever, and the total weight ofthe trailer is supported by said ground plate during the core drillingoperation.

2. The apparatus of claim 1, wherein said chassis has a supporting plateconnected to and forming the forward portion thereof, said supportingplate defining a base for said counterbalance.

3. The apparatus of claim 2, wherein said counterbalance comprises awash Water container.

4. The apparatus of claim 2, wherein said base is a pivotal support forsaid lever.

5. The apparatus of claim 1, wherein said core drilling means comprisesa post mounted on said ground plate, and guide rails on said postwhereby a 4-cycle internal combustion engine having a direct flangedconnection to a drilling head is directed into position.

6. The apparatus of claim 1, further comprising means for firmlyconnecting said ground plate to said chassis whereby said drillingmechanism is transported.

References Cited UNITED STATES PATENTS 2,084,686 6/1937 Howard 173-232,673,452 3/1954 Glaye 17323 3,189,104 6/1965 Jamer et al 173-223,220,494 11/1965 Cannon et al. 173-28 3,302,730 2/ 1967 Bellsmith173--28 MILTON KAUFMAN, Primary Examiner.

20 L. P. KESSLER, Assistant Examiner.

1. A TRANSPORTABLE CORE DRILLING APPARATUS HAVING CORE DRILLING MEANSFOR TAKING PAVEMENT SAMPLES, THE IMPROVEMENT COMPRISING A SINGLE AXLETRAILER CHASSIS, SAID CORE DRILLING MEANS MOUNTED ON A RIGID GROUNDPLATE, LEVER MEANS PIVOTALLY CONNECTING SAID CHASSIS AND SAID GROUNDPLATE AND A COUNTER-BALANCE MOUNTED ON THE FRONT OF SAID CHASSIS WHEREBYSAID CORE DRILLING MEANS IS SHIFTED FROM A TRANSPORT POSITION TO THESURFACE OF THE PAVEMENT BY MEANS OF SAID LEVER, AND THE TOTAL WEIGHT OFTHE TRAILER IS SUPPORTED BY SAID GROUND PLATE DURING THE CORE DRILLINGOPERATION.